First, the mechanism of action Through the application of ring cutting, cerclage and girdling technology, fruit trees can cut off the carbohydrates produced by the leaves through the cortex to the roots, and thus accumulate in the branches and buds, promote new shoots and mature, inhibit the germination of winter shoots, Effectively promote flower bud differentiation, flower formation and fruit setting. 2. Applicable objects are mainly applicable to young trees or prosperous juvenile trees in woody fruit trees and vines fruit trees with sufficient fertilizer and water, high management level, thick green leaves, thick green leaves, etc., but can not be applied to weak trees. Otherwise it will cause a serious decline in the tree potential, or even death. At the same time, be careful not to carry out circumcision and girdling on the main trunk, nor should each main branch be badly cut, cerclage and girdling, and leave some shoots to send nutrients to the roots to ensure the nutritional needs of the normal growth of the root system. Third, the operation method 1, ring cutting sites and methods Select sunny weather sooner or later, and select the main branch or backbone of 5-10 cm thick, with a thin and sharp knife in the ring cut site for ring cutting, the two incisions should be aligned Make sure that the cortex is cut off and the depth is just up to the xylem. Usually circumcision 1-2 times, depth to reach xylem. 2, girdling sites and methods Select sunny weather, in the morning and evening with a thin and sharp knife, select 5-10 cm of the main trunk or backbone, in the girdling part for the spiral girdling, the depth to just reach the xylem, Gently peel without damaging xylem. The width of girdling is about 0.2-0.5 cm, 1-2 staggered half-turns are appropriate, and the two stripping mouths are at least 4 cm apart. Stripped mouth should be more than 20 cm above the ground, can not repeat the same position girdling, and should be moved upwards year by year. Grape girdling should be done in the internodes under the flower ear. 3, cerclage sites and methods of its operation and ring cutting similar. Select No. 14-16 money line to circumscribe on the main trunk or main branch, tie the iron bar to tightly tie the bark slightly to degree, do not tie the iron wire into the bark, 30-40 days later see the wire caught in the bark Or when the leaves turn yellow, they should be unfastened. IV. Application of Production 1. Inhibit the germination of winter shoots and promote flower bud differentiation Litchi: Early-maturing variety March red, usually from late September to early 10th; Medium and late-maturing varieties are generally from late November to December. The shoots are mature during the middle of the shoot, but if possible, the trees that shoot the winter shoots should be carried out in advance. The glutinous rice glutinous rice cake, cinnamon glutinous rice, etc., are difficult to grow into flowers. Longan: Normally after November-December when the old shoots are cooked. Citrus: After the autumn shoots turn green in September or from late November to early December. Mango: A ring cut or cerclage method is used one month before flowering, but cerclage is usually earlier than circumcision. In general, cerclage is performed in January, and circumcision is preferred in the middle and late February. 2. Increase fruit setting rate, increase fruit size, reduce physiological drop fruit litchi, longan, citrus and other woody fruit trees: Ringing or girdling 15-20 days before flowering can promote flowering and improve fruit setting rate; The use of cerclage or circumcision in the first half or so of fruit drop can reduce physiological fruit drop. Grapes: girdling 5 days before flowering, can improve the grape flower nutrition, improve the fruit setting rate; fruit after rapid flowering girdling, can increase fruit size; girdling in the fruit coloring period, can improve quality and promote early maturity. V. Precautions The above methods must be selectively applied in certain situations. Usually do not use the two methods at the same time. Do not use them continuously for one year. It is better not to use them every year. They are only complementary to management measures. It cannot replace necessary and normal production management measures. As to which method is more applicable, it depends on the specific fruit tree, application time and management level. (Zhongshan Agricultural School Zhong Yaoxing)
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